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Q1: 1. All joints, connections, and splices shall be contained in a box a) Trueb) FalseSee Answer
Q2: Q4: Which equation is for series resistors and which equation is for parallel resistors? \text { A } \quad R_{e q}=R_{1}+R_{2}+R_{3}+\cdots \text { B } \frac{1}{R_{e q}}-\frac{1}{R_{1}}+\frac{1}{R_{2}}+\frac{1}{R_{3}}+\cdotsSee Answer
Q3: (a) Four diodes are connected in a circuit as shown. In the positive cycle, A is more positive than B. i) In the negative half-cycle, which diodes are reversed bias? ii) Explain briefly what would happen if D2 were shorted in this circuit. iii) What would happen if D2 were open? (b) Design a power supply to deliver a regulated DC supply of 12 V, with a peak-to-peak ripple under 50mV. You may use US or UK line voltage as the input source. Assume the Zener resistance is equal toX ohms. i) Draw the circuit diagram and label each component. ii) Calculate the peak secondary voltage, the DC voltage measured across the capacitor and the ripple in this voltage (before regulation). 111) Describe two limits on load voltage and current that relate to the safe operation of the diodes in your design.See Answer
Q4: 5. Explain Ohms law in detail and give an example to show how it is used calculate current in a series circuit.See Answer
Q5: 6. In the circuit below calculate the following: . Total resistance. The ammeter reading. The voltage dropped across R1. The reading on the ammeter if a second voltage source (battery) wasplaced in the circuit with a value of 27V (series aiding). The reading on the ammeter if a second voltage source (battery) wasplaced in the circuit with a value of 4V (series opposing).See Answer
Q6: 2. Differentiate between the piezoelectric effect and the converse piezoelectric effect.See Answer
Q7: 3. Explain the term polarisation of a cell and discuss methods commonly used to prevent it from happening.See Answer
Q8: 2. Design a cascading LC low-pass Butterworth filter that has magnitude ratio flat to within 3dB at 70 Hz but with an attenuation of at least 30DB for all frequencies stand above 175 Hz. Assume that R, = RL = 502. Determine the number of stages needed in the filter and the values of L's and C's in physical units (The normalized LC values for each stage are listed in a table on page 6).See Answer
Q9: 3. A force sensor has the following frequency response. What is the system order ofthe force sensor? Determine the system static and dynamic system parameters. Frequency (rad/sec)Write the transfer function for the force sensor. [Hint: The transfer function consists ofsystem static and dynamic parameters, e.g. static sensitivity & time constant for first ordersystem and static sensitivity, natural frequency, & damping ratio for second order system].See Answer
Q10: The BJT in the circuit shown hasthe following characteristics: \begin{array}{l} V_{B E}=0.7 \mathrm{~V}, V_{A}=200 \mathrm{~V} \text { and } \beta_{F} \\ =120 \end{array} \text { Determine } I_{C} \text { and } V_{C E} Draw the AC Model circuit Draw the small-signal model O Find the h-parameters Remember: h-parameter modelis the same for npn and pnp BJT See Answer
Q11: Solve the initial value problem (3 x+2 y) d x-(3 x+2 y+2) d y=0, \quad y(-1)=-1See Answer
Q12: Solve the Differential equation \left(x^{2}+y^{2}-5\right) d x-(y+x y) d y=0See Answer
Q13: 03. A line with a uniform charge density of n (C/m) is lying between the points P_{1}\left(\begin{array}{c} -1 \\ -1 \\ 0 \end{array}\right) \text { and } P_{2}\left(\begin{array}{c} 1 \\ -1 \\ 0 \end{array}\right) Another line with the same uniform charge density of n (\mathrm{C} / \mathrm{m}) \text { is lying between the points } P_{1}\left(\begin{array}{c} -1 \\ 1 \\ 0 \end{array}\right) \text { and } P_{2}\left(\begin{array}{l} 1 \\ 1 \\ 0 \end{array}\right) . \text { What is the electric field } \text { at point } B\left(\begin{array}{l} 0 \\ 0 \\ 1 \end{array}\right) ?See Answer
Q14: \text { Q2. There is a proton at point } P_{1}\left(\begin{array}{l} 1 \\ 0 \\ 0 \end{array}\right) \text { and another proton at point } P_{2}\left(\begin{array}{c} -1 \\ 0 \\ 0 \end{array}\right) \text { , The } charge of a proton is 1.602 x 10^-19 C. \text { (a) What is the electric field at point } B\left(\begin{array}{l} 0 \\ 1 \\ 0 \end{array}\right) \text { ? } (b) If another proton is placed at point B, that is force experienced by the proton at B due to other two protons?See Answer
Q15: \text { Q1. Consider two vectors } A=\left(\begin{array}{l} 2 \\ 1 \\ 0 \end{array}\right) \text { and } B=\left(\begin{array}{c} -1 \\ 2 \\ 0 \end{array}\right) \text { . } (a) What is the unit vector which is in the same direction with vector A? (b) What is the dot product of A and B? (c) What is the angle between these two vectors?See Answer
Q16: Complete the design of the amplifier shown below given the DC and AC load lines on thegraph. (a) Determine the value of Ic and V (CE) when the transistor is biased, as shown by the graph of mac and mdc? Determine R(e1) and R(e2). (Hint: DC Circuit has both Emitter Resistors, and AC model has only R(e1) (c) Draw the small-signal model. Include the h-parameter values. (d) Determine the voltage gain of the amplifier. The BJT parameters are: BF= 150 and VA= 350 V (large). See Answer
Q17: b) A series RLC circuit as shown in Figure 3 has a resonant frequency of 628.32 rad/s, capacitance, C= 60uf and the quality factor, Q= 10, it is driven by a voltage source: ) Calculate the values of R. L and bandwidth of the circuit. (H) Explain the difference between series RLC and parallel RLC circuit using frequency response diagram. See Answer
Q18: 7. When using a # 12 THWN copper wire in a branch circuit, the over-current protection shall not exceed 20 Amps. a) True b) FalseSee Answer
Q19: 10. The switch shall always interrupt the neutral wire. a) True b) FalseSee Answer
Q20: 6. As the AWG number becomes smaller, the wire size becomes a) Larger b) SmallerSee Answer

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